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(No Model.)

H. VAN NOSTRAND SAW GUMMBR. No. 312,935. Patented Feb. 24. 1885.

NTTnn STATES PATENT @Trice HAZEN VAN NOSTRAND, OF GLOVERSVILLE, NEW' YORK.

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SPECIFICATION forming part of Letters Patent No. 312,935, dated February 24, 18185.

' nppncauonnlea `Muy 1o, 1884. (No model.)

To @ZZ whom it may concern.-

Be it known that I, HAZEN VAN NosrnANi), a citizen ofthe United States, residing at Gloversville, in the county of Fulton andl State of New York, have invented certain new and useful Improvements in Saw-Gummers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or gures of reference marked thereon, which form a part of this specification.

Figure l of the drawings is a plan view of my device. Fig. 2 is avertical sectional view ofthe same. Fig. 3 is a transverse section. Figs. 4 and 5 are detail views.

The invention relates to that class of gummers in which the sawblade passes into aslit or recess in the device, and is engaged therein by set-screws or other proper means while being operated upon 5 audits object is to provide the devicel with a cutter, preferably of cylindrical form, which, without the saw blade being moved, will bite continuously into the edge of the same, and which may be run at a high rate of speed without heating.

rlhe invention essentially consists in providing the gummer with a crank-shaft for carrying the cutter, one end of which shaft is threaded and passes through a proper nut to make the cutter travel across the edge of the saw-blade. The other end of the crank-shaft passes at right angles through and rotates in a guide part provided with a dovetailed foot. The said foot, driven by the crank-shaft, trav-V els in a dovetailed groove, into which it fits snugly, outward and laterally, in the direction to carry the cutter attached to the shaft deeper in between the teeth of the saw-blade, which is xed by set-screws or other 4proper means at right angles to said shaft and cutter, the cutter being cylindrical and fixed concen` trically upon the shaft.

Ihe invention further consists of certain details of construction, hereinafter more fully described. i

In the accompanying drawings, A represents the frame of the device, composed of the two lateral parts B and C, having between 'their inner surfaces the slit or recess D, to acseparated at the top bythe end clips, a a, provided with the vertical set-screws a a, which bear upon the upper edge of the sawblade and regulate its height.

The part B is composed of the two upright end arms, b b, having between them the depression or recess b and an outward projection, b2, standing centrallyk at right angles from its outer surface flush with the bottom of the recess b. b b3 are horizontal set-screws passing through the part B near the ends of its lower edge to fix the saw-blade when it is in proper position. Z)4 is a dovetailed groove made in the upper surface of the projection bt or in the upper surface of a piece attached to the same. The said grooveinelines from within outward in the direction opposite to that in which the teeth of the saw point when the latter is in position.

The part C is provided with two upright arms, c c, similar to and opposite the arms b b, and having between them a recess, c', simi lar and opposite to b.- The clips c c rest between the said opposite arms and form the top wall of the recess D. cL7 is an koutward projection from the part C, standing centrally at right angles to its outer surface, and composed of the horizontal floor or bottom c3, iiush withthe 'bottom Vof the recess c and the vertical sides c'L ct, which rise from the edges of said door to the top of the arms c c. The projection c2 has xed transversely in its outer end between the sides a proper box, c5, to carry the nut E, which is divided in its transverse diameter into the parts e and e. The

lower part, e, rests within the lower part of the box, with its upper edge horizontal. The upper part, e', has its upper edge squared, and is made vertically adjustable within the upper part of the box by means and for a purpose hereinafter described.

F is the crank-shaft,having at opposite ends the crank-shaft passes concentrically through the cutter G, and also through the guide-post,

which is provided at its lower end with a dovetailed foot, g, which fits snugly and moves longitudinally within the dovetailed groove b4. The guide-post is also provided with an opening, g', through which the arm f passes, and in which itA freely turns, being fixed in the proper position therein by means of a pin passing through the guide-post and engaging in a circumferential groove on said arm, o r by l oth er proper means.

G is the cutter, cylindrical in form, and provided with the longitudinal cutting-edges h h, so as to form a burr. The said cutter is fixed concentrically upon the part f2 of the crankshaft in such manner that it may be removed, if desired, and another of different size and shape substituted.

I is a horizontal transverse rod passing through the upper part of the sides c4 c4, above the box, containing nut E, and carrying between said sides the cam z', which may be turned down upon the upper squared edge of the part eof the nut when it is desired to make said nut closely engage the threaded arm l z5 f, the upper edge ofthe box c5 being cut away to allow it free passage. 'Ihe rod I is preferably threaded where it passes through either ofthe sides c4', so as to hold the cam firmly against the upper part of the nut.

The operation of the device is as follows:

The saw-blade being set in proper position by which thereupon engages the threaded armf of the crank-shaft. The cranks are then yturned in the proper direction, and by the the groove b, and consequently the cutter is drawn continuously deeper between the teeth and bites deeper into the saw-blade.

from the nut, and the arm uf consequently disengaged from the same. The crank may then be slid by hand into proper position to" begin another cut.

The cutter during the operation brings to bear at every revolution a different part of the surface upon the edge of the saw-blade, and consequently can be rotated at a high rate of speed without being heated by friction.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In the saw-gummer, the combination,with thevcrank-shaft F, provided with the armf Aand with the threaded arm f, which has a bearing in a nut properly attached to the frame of the device, of the cylindrical cutter H, guide-post G, and the supporting-frame having dovetailed groove b, substantially as speciiied.

2. In a sawgurnmer, the combination,with a crankshaft-having a proper bearing at one end, and provided at the other end with the threaded armf, of the nut E, composed ofthe parts e and e', the box c5, and rod I, provided with the cam z', substantially as specified.

3. The combination, with the main frame, reamer shaft, and means for operating the same, of the nut E, co-operating with the threaded section of the shaft, the rod I, and cam z', substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses. y

HAZEN VAN NOSTRAND.

Vitnesses:

A. A. HELLWIG, D. SorDMoRn.

When v vone cut has been made, the cam is released 

